CN116335538B - Compensation mechanism of directional rotary guide actuating mechanism - Google Patents
Compensation mechanism of directional rotary guide actuating mechanism Download PDFInfo
- Publication number
- CN116335538B CN116335538B CN202310630127.0A CN202310630127A CN116335538B CN 116335538 B CN116335538 B CN 116335538B CN 202310630127 A CN202310630127 A CN 202310630127A CN 116335538 B CN116335538 B CN 116335538B
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- drill collar
- cylinder body
- connecting piece
- compensation mechanism
- motor
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- 230000007246 mechanism Effects 0.000 title claims abstract description 86
- 238000006073 displacement reaction Methods 0.000 claims abstract description 25
- 239000010687 lubricating oil Substances 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims description 44
- 239000002002 slurry Substances 0.000 claims description 17
- 229920001971 elastomer Polymers 0.000 claims description 3
- 239000000806 elastomer Substances 0.000 claims description 3
- 239000010720 hydraulic oil Substances 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
- E21B7/061—Deflecting the direction of boreholes the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a compensation mechanism of a directional rotary guide actuating mechanism, which comprises a motor, a deflection shaft and a guide shaft which are arranged in a drill collar, wherein the compensation mechanism comprises a displacement compensation mechanism which is arranged in the drill collar, the displacement compensation mechanism is used for enabling a closed cavity to be formed in a region among the displacement compensation mechanism, the drill collar and the guide shaft, the motor and the deflection shaft are both arranged in the closed cavity, and lubricating oil is filled in the closed cavity. The drill collar is internally provided with the displacement compensation mechanism, and a closed cavity is formed between the displacement compensation mechanism and the drill collar and the guide shaft, so that the motor and the deflection shaft can be arranged in the closed cavity, hydraulic oil is filled in the closed cavity, a hydraulic oil environment can be provided for the motor and the deflection shaft, and the stability and the service life of the whole actuating mechanism are improved.
Description
Technical Field
The invention belongs to the technical field of directional rotary guide, and particularly relates to a compensation mechanism of a directional rotary guide executing mechanism.
Background
The directional rotary steering provides a tilt angle inconsistent with the axis of the well bore for the drill bit to generate steering action through the internal biasing mechanism, and the steering well drilling is independent of the well wall and the geological environment. The directional rotary guide is divided into a static bias directional rotary guide and a dynamic directional rotary guide according to different working modes of the internal biasing mechanism, and the static bias directional rotary guide depends on thrust applied to the mandrel in different directions to generate bending in controllable directions to achieve a directional effect. The dynamic directional rotary guide drives the bias of the controllable direction of the drill bit by means of an internal dynamic bias mechanism, so that directional drilling is realized.
When the dynamic directional rotary guiding internal dynamic biasing mechanism works, the friction force between all transmission parts is reduced by lubricating oil, and the motion precision of the transmission parts is improved, so that when the biasing mechanism works, a compensating mechanism is required, and a motor, a transmission shaft and the like are always in a closed cavity filled with the lubricating oil, so that the motion precision of the transmission parts is improved.
Disclosure of Invention
In order to solve all or part of the problems, the invention aims to provide a compensation mechanism of a directional rotary guide actuator, wherein a closed cavity is formed in a drill collar through the arrangement of a displacement compensation mechanism, and a motor and a deflection shaft are positioned in the closed cavity filled with lubricating oil, so that an external mud environment and the closed cavity can be isolated.
According to one aspect of the invention, there is provided a compensation mechanism for a directional rotary steerable actuator comprising a motor, a yaw axis and a steering axis disposed within a drill collar, the compensation mechanism comprising a displacement compensation mechanism disposed within the drill collar, the displacement compensation mechanism being adapted to form a closed cavity in a region between the displacement compensation mechanism, the drill collar and the steering axis, the motor and the yaw axis both being disposed within the closed cavity, the closed cavity being filled with lubricating oil.
Further, the displacement compensation mechanism comprises a first connecting piece and a second connecting piece which are arranged in the drill collar, the first connecting piece and the second connecting piece are flexible connecting pieces, the first connecting piece is sleeved on the guide shaft, the first connecting piece is respectively connected with the drill collar and the guide shaft in a sealing mode, the motor, the deflection shaft and the guide shaft are sleeved on the second connecting piece, one end of the second connecting piece is connected with the drill collar in a sealing mode, the other end of the second connecting piece is connected with the guide shaft in a sealing mode, and the closed cavity is a space among the drill collar, the first connecting piece, the guide shaft and the second connecting piece.
Further, the first connecting piece is a corrugated pipe, one end of the corrugated pipe is connected with the guide shaft in a sealing mode, and the other end of the corrugated pipe is connected with the drill collar in a sealing mode.
Further, the second connecting piece is a flexible pipe, one end of the flexible pipe is connected with an upper connector in a sealing mode, the upper connector is sleeved on the flexible pipe, and the upper connector is connected with the drill collar in a sealing mode; the flexible pipe is also sleeved with a lower connector, and the lower connector is respectively connected with the flexible pipe and the guide shaft in a sealing manner.
Further, the compensation mechanism further comprises a pressure compensation mechanism arranged in the drill collar, and the pressure compensation mechanism is used for reducing the pressure difference between the closed cavity and external mud.
Further, the pressure compensation mechanism comprises a pressure balance unit, an inner cylinder body and an outer cylinder body, wherein the pressure balance unit, the inner cylinder body and the outer cylinder body are all arranged in the closed cavity, the outer cylinder body is sleeved outside the inner cylinder body, a mud hole is formed in the drill collar, a through hole corresponding to the mud hole is formed in the outer cylinder body, and the drill collar and the outer cylinder body on two sides of the through hole are in sealing connection; the pressure balance unit is arranged between the inner cylinder body and the outer cylinder body on one side of the through hole and is respectively in sealing connection with the inner cylinder body and the outer cylinder body, the inner cylinder body and the outer cylinder body on the other side of the through hole are in sealing connection, and the pressure balance unit is used for compressing the closed cavity under the pressure of slurry so as to reduce the pressure difference between the closed cavity and external slurry.
Further, the motor and the guide shaft are respectively located at two ends of the inner cylinder body, the deflection shaft is arranged between the second connecting piece and the inner cylinder body, one end of the deflection shaft is connected with the motor, and the other end of the deflection shaft is connected with the guide shaft.
Further, a first end cover is arranged between the inner cylinder body and the outer cylinder body at the other side of the through hole, and the first end cover is respectively connected with the inner cylinder body and the outer cylinder body in a sealing way.
Further, the pressure balancing unit comprises a piston and an elastic body, the piston is respectively connected with the inner cylinder body and the outer cylinder body in a sliding sealing mode, the elastic body is arranged on one side, far away from the through hole, of the piston, and the elastic body is configured to be in an extending state.
Further, the pressure balance unit is arranged between the motor and the through hole, a second end cover is arranged between the piston and the motor, one end of the elastic body is connected with the second end cover, the other end of the elastic body is connected with the piston, and the elastic body is a spring.
According to the technical scheme, the compensation mechanism of the directional rotary guide executing mechanism provided by the invention has the following beneficial effects:
the drill collar is internally provided with the displacement compensation mechanism, and a closed cavity is formed between the displacement compensation mechanism and the drill collar and the guide shaft, so that the motor and the deflection shaft can be arranged in the closed cavity filled with lubricating oil, the motor and the deflection shaft are isolated from external slurry, and the running accuracy of the motor and the deflection shaft is improved.
Drawings
FIG. 1 is a view of a portion of a directional rotary steerable actuator and compensation mechanism in accordance with an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a compensation mechanism according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a portion of a displacement compensation mechanism according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a portion of a pressure compensating mechanism of an embodiment of the present invention;
FIG. 5 is a cross-sectional view of a pressure compensating mechanism portion and a drill collar portion of an embodiment of the present invention;
the reference numerals in the drawings are: drill collar 1, upper connector 2, motor 3, elastomer 4, piston 5, second end cover 6, centering ring 7, inner cylinder 8, outer cylinder 9, first end cover 10, deflection shaft 11, guiding shaft 12, first connector 13, second connector 14, lower connector 15, mud hole 16, through hole 17, mud cavity 18.
Detailed Description
For a better understanding of the objects, structures and functions of the present invention, a compensating mechanism for a directional rotary steerable actuator according to the present invention will be described in further detail with reference to the accompanying drawings.
The compensating mechanism is used for a directional rotary guide executing mechanism, and particularly the directional rotary guide executing mechanism comprises a motor 3, a deflection shaft 11 and a guide shaft 12 which are arranged in a drill collar 1, when the dynamic directional rotary guide executing mechanism works, a structural inclination angle is formed between the guide shaft 12 and the deflection shaft 11, the structural inclination angle causes the bias of a drill bit, the rotation of the deflection mechanism is driven by the motor 3 so as to control the inclination direction of the drill bit, and when the rotation speed of the motor 3 is equal to the rotation speed of the drill collar 1 in opposite directions, the inclination direction of the drill bit to the ground is unchanged, the tool surface of a tool is unchanged, and the purpose of directional drilling is achieved.
1-3, the compensation mechanism of the embodiment comprises a displacement compensation mechanism arranged in the drill collar 1, wherein the displacement compensation mechanism is used for enabling an area among the displacement compensation mechanism, the drill collar 1 and the guide shaft 12 to form a closed cavity, so that when the guide shaft 12 and the drill collar 1 move relatively, the displacement compensation mechanism always enables an area among the displacement compensation mechanism, the drill collar 1 and the guide shaft 12 to form a closed cavity, and the motor 3 and the deflection shaft 11 are arranged in the closed cavity, so that the motor 3 and the deflection shaft 11 can be isolated from an external mud environment through the closed cavity, and lubricating oil is filled in the closed cavity, so that on one hand, the motor 3 and the deflection shaft 11 can be lubricated, and on the other hand, the motor 3 and the deflection shaft 11 can be cooled, so that the stability and the service life of an actuating mechanism can be improved.
Specifically, as shown in fig. 3, the displacement compensation mechanism includes a first connecting piece 13 and a second connecting piece 14 that are disposed in the drill collar 1, the first connecting piece 13 is sleeved on the guide shaft 12, the first connecting piece 13 is respectively and fixedly connected with the drill collar 1 and the guide shaft 12 in a sealing manner, the motor 3, the deflection shaft 11 and the guide shaft 12 are all sleeved on the second connecting piece 14, one end of the second connecting piece 14 is fixedly connected with the drill collar 1 in a sealing manner, and the other end of the second connecting piece 14 is connected with the guide shaft 12 in a sealing manner, in this embodiment, the purpose of forming a closed cavity among the drill collar 1, the guide shaft 12 and the displacement compensation mechanism is achieved through the arrangement of the first connecting piece 13 and the second connecting piece 14, and the closed cavity is a space among the drill collar 1, the first connecting piece 13, the guide shaft 12 and the second connecting piece 14; in order to make the displacement compensation mechanism of the present embodiment work normally when used in a dynamic directional rotary steering actuator, the first connecting member 13 and the second connecting member 14 of the present embodiment are flexible connecting members, that is, the first connecting member 13 and the second connecting member 14 of the present embodiment are capable of deforming along with the relative movement between the drill collar 1 and the guide shaft 12.
Specifically, the first connecting piece 13 is a bellows, one end of the bellows is fixedly connected with the guide shaft 12 in a sealing manner, the other end of the bellows is fixedly connected with the drill collar 1 in a sealing manner, in this embodiment, the first connecting piece 13 is specifically a bellows, and the connection between the drill collar 1 and the guide shaft 12 is realized through the bellows, and the bellows can deform, so that the requirements of relative movement between the drill collar 1 and the guide shaft 12 can be met. In addition, as can be seen from the foregoing, the first connecting member 13, the second connecting member 14, the guide shaft 12 and the drill collar 1 form a closed cavity, so in this embodiment, the closed cavity is filled with lubricating oil, and by filling the closed cavity with lubricating oil, on the one hand, the lubricating oil can lubricate the motor 3 and the deflection shaft 11, and on the other hand, the lubricating oil can cool the motor 3 and the deflection shaft 11.
Specifically, the second connecting piece 14 is a flexible pipe, one end of the flexible pipe is fixedly connected with an upper connector 2 in a sealing manner, the upper connector 2 is sleeved on the flexible pipe, and the upper connector 2 is fixedly connected with the drill collar 1 in a sealing manner; the flexible pipe is also sleeved with a lower connector 15, and the lower connector 15 is respectively connected with the flexible pipe and the guide shaft 12 in a sealing way.
In an embodiment, as shown in fig. 1-2 and 4-5, the compensation mechanism further comprises a pressure compensation mechanism arranged in the drill collar 1, wherein the pressure compensation mechanism is used for reducing the pressure difference between the closed cavity and external mud. Along with the gradual penetration of the directional rotary guide executing mechanism into the underground, the mud pressure born by the directional rotary guide executing mechanism is gradually increased, and the pressure bearing strength of parts is mainly improved in the prior art so as to meet the operation requirement that the directional rotary guide executing mechanism gradually penetrates into the underground; in this embodiment, the compensating mechanism further includes a pressure compensating mechanism, and the pressure compensating mechanism can reduce the pressure difference between the closed cavity and the external slurry, so that the requirement of the operation of extending into the well can be met without improving the bearing strength of the parts.
In an embodiment, as shown in fig. 1 to 5, the pressure compensation mechanism includes a pressure balancing unit, an inner cylinder 8 and an outer cylinder 9, the pressure balancing unit, the inner cylinder 8 and the outer cylinder 9 are all disposed in the closed cavity, the outer cylinder 9 is sleeved outside the inner cylinder 8, a mud hole 16 is formed in the drill collar 1, a through hole 17 corresponding to the mud hole 16 is formed in the outer cylinder 9, and the drill collar 1 and the outer cylinder 9 on two sides of the through hole 17 are all in sealing connection; the pressure balance unit is arranged between the inner cylinder 8 and the outer cylinder 9 on one side of the through hole 17, the pressure balance unit is respectively in sealing connection with the inner cylinder 8 and the outer cylinder 9, the inner cylinder 8 and the outer cylinder 9 on the other side of the through hole 17 are in sealing connection, the pressure balance unit is in sliding connection with the inner cylinder 8, and the pressure balance unit is used for compressing the closed cavity under the pressure of slurry so as to reduce the pressure difference between the closed cavity and the external slurry.
In this embodiment, the pressure compensation mechanism specifically includes an inner cylinder 8, an outer cylinder 9, and a pressure balancing unit, where the inner cylinder 8, the outer cylinder 9, and the pressure balancing unit are all disposed in a closed cavity formed by the drill collar 1, the first connecting piece 13, the guide shaft 12, and the second connecting piece 14, and a mud hole 16 is formed in the drill collar 1, and a through hole 17 corresponding to the mud hole 16 is formed in the outer cylinder 9, and mud can enter the outer cylinder 9 through the through hole 17 and the arrangement of the mud hole 16; in order to isolate the slurry from the lubricating oil in the closed cavity, the drill collar 1 and the outer cylinder 9 at two sides of the through hole 17 are in sealing connection, the pressure balance unit is respectively in sealing connection with the inner cylinder 8 and the outer cylinder 9, and the inner cylinder 8 and the outer cylinder 9 are in sealing connection, so that a slurry cavity 18 communicated with the outside is formed in an area surrounded by the inner cylinder 8, the outer cylinder 9 and the pressure balance unit through the sealing connection of all parts, and the isolation between the slurry cavity 18 and the closed cavity is realized; the pressure balance unit can slide along the inner cylinder 8, so that as the pressure in the slurry cavity 18 increases, the pressure balance unit of the embodiment can move along the inner cylinder 8 to compress the closed cavity, thereby reducing the pressure difference between the closed cavity and the external slurry.
In one embodiment, as shown in fig. 1, the motor 3 and the guide shaft 12 are respectively located at two ends of the inner cylinder 8, the deflection shaft 11 is disposed between the second connecting member 14 and the inner cylinder 8, one end of the deflection shaft 11 is connected to the motor 3, and the other end of the deflection shaft 11 is connected to the guide shaft 12.
In an embodiment, as shown in fig. 1 to 5, a first end cover 10 is disposed between the inner cylinder 8 and the outer cylinder 9 at the other side of the through hole 17, and the first end cover 10 is respectively connected with the inner cylinder 8 and the outer cylinder 9 in a sealing manner. In this embodiment, the sealing connection between the inner cylinder 8 and the outer cylinder 9 is achieved by means of a first end cap 10.
In an embodiment, as shown in fig. 1 to 5, the pressure balancing unit includes a piston 5 and an elastic body 4, the piston 5 is slidably and hermetically connected with the inner cylinder 8 and the outer cylinder 9, the elastic body 4 is disposed on one side of the piston 5 far away from the through hole 17, one end of the elastic body 4 is fixedly connected with the piston, and the other end of the elastic body is fixedly connected with the second end cover 6. In this embodiment, the pressure balancing unit includes a piston 5 and an elastic body 4, as the depth increases, the external slurry pressure increases, the piston 5 moves in the direction of compressing the closed cavity under the driving of the pressure difference, so as to compress the lubricating oil, so that the pressure difference between the pressure in the closed cavity and the pressure of the external slurry is in a small range, the elastic body 4 is always in a stretched state, so that the pressure of the internal lubricating oil is slightly greater than the pressure of the external slurry, the risk of being invaded by the slurry is reduced, and in addition, a centralizing ring 7 is arranged between the inner cylinder 8 and the piston 5.
In an embodiment, the pressure balancing unit is disposed between the motor 3 and the through hole 17, a second end cover 6 is disposed between the piston 5 and the motor 3, one end of the elastic body 4 is connected with the second end cover 6, the other end of the elastic body 4 is connected with the piston 5, the elastic body 4 is a spring, and in an initial state, the closed cavity is filled with lubricating oil, so that the spring is in a stretched state under the pressure difference of two sides of the piston 5; when the device is specifically used, as the depth is increased, the external mud pressure is increased, the piston starts to move leftwards under the mud pressure, the extension of the spring is gradually reduced, but the spring is always in an extension state, and the pressure of lubricating oil is always greater than that of the external mud, so that the external mud is prevented from penetrating into the lubricating oil.
Specifically, a mud hole 16 is formed in the drill collar 1, a through hole 17 is formed in the outer cylinder 9, the first end cover 10 is located below the through hole 17, the piston 5 is located above the through hole 17, the mud hole 16 is communicated with the through hole 17, so that mud can flow into a space defined by the piston 5, the inner cylinder 8, the outer cylinder 9 and the first end cover 10 are fixedly connected through pins, the inner cylinder 8 and the first end cover 10 are fixedly connected through threads, the piston 5 is respectively in sealing connection with the inner cylinder 8 and the outer cylinder 9, and the first end cover 10 is respectively in sealing connection with the inner cylinder 8 and the outer cylinder 9, so that a closed mud cavity for the mud to flow in is formed.
Drill collar 1 and last connector 2 fixed connection, motor 3 and outer barrel 9 fixed connection, outer barrel 9 and first end cover 10 fixed connection, interior barrel 8 and first end cover 10 fixed connection, the inner wall of second end cover 6 is equipped with the step that keeps off in the top of barrel 8, the step of second end cover 6 makes the step pressure of second end cover in barrel 8 through the tensile force effect of spring after filling lubricating oil, go up connector 2 and second connecting piece 14 between be threaded connection, be fixed sealing connection between second connecting piece 14 and the lower connector 15, be sealing connection between guiding axle 12 and the lower connector 15, the lower extreme of second connecting piece 14 is then fixed through other structures on the drill collar 1.
In order to avoid that the deflection shaft 11 wears the inner cylinder 8, the deflection shaft 11 is arranged coaxially with the inner cylinder 8 with a gap between them, which gap can also be used for lubricating oil to flow through; in addition, in order to lubricate the motor, the second end cover 6 is provided with a lubricant circulation hole which communicates with the closed cavity and the space where the motor 3 is located, so that the motor 3, the deflection shaft 11 and the guide shaft 12 are all in a lubricant environment.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.
Furthermore, the terms "a," "an," "the" and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is two or more unless specifically defined otherwise.
In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (9)
1. The compensating mechanism of the directional rotary guide actuating mechanism comprises a motor, a deflection shaft and a guide shaft which are arranged in a drill collar, and is characterized by comprising a displacement compensating mechanism which is arranged in the drill collar, wherein the displacement compensating mechanism is used for enabling a sealed cavity to be formed in a region among the displacement compensating mechanism, the drill collar and the guide shaft, the motor and the deflection shaft are both arranged in the sealed cavity, and lubricating oil is filled in the sealed cavity; the displacement compensation mechanism comprises a first connecting piece and a second connecting piece which are arranged in the drill collar, the first connecting piece and the second connecting piece are flexible connecting pieces, the first connecting piece is sleeved on the guide shaft, the first connecting piece is respectively connected with the drill collar and the guide shaft in a sealing mode, the motor, the deflection shaft and the guide shaft are sleeved on the second connecting piece, one end of the second connecting piece is connected with the drill collar in a sealing mode, the other end of the second connecting piece is connected with the guide shaft in a sealing mode, and the closed cavity is a space among the drill collar, the first connecting piece, the guide shaft and the second connecting piece.
2. The compensation mechanism of a directional rotary steerable actuator according to claim 1, wherein the first connector is a bellows, one end of the bellows is sealingly connected to the steering shaft, and the other end of the bellows is sealingly connected to the drill collar.
3. The compensation mechanism of the pointing rotary steering actuator according to claim 1, wherein the second connecting piece is a flexible pipe, one end of the flexible pipe is connected with an upper connector in a sealing manner, the upper connector is sleeved on the flexible pipe, and the upper connector is connected with the drill collar in a sealing manner; the flexible pipe is also sleeved with a lower connector, and the lower connector is respectively connected with the flexible pipe and the guide shaft in a sealing manner.
4. The compensation mechanism for a directional rotary steerable actuator according to claim 1, further comprising a pressure compensation mechanism disposed within the drill collar for reducing a pressure differential between the enclosed cavity and the external mud.
5. The compensation mechanism of the directional rotary guide execution mechanism according to claim 4, wherein the pressure compensation mechanism comprises a pressure balance unit, an inner cylinder body and an outer cylinder body, the pressure balance unit, the inner cylinder body and the outer cylinder body are all arranged in the closed cavity, the outer cylinder body is sleeved outside the inner cylinder body, a mud hole is formed in the drill collar, a through hole corresponding to the mud hole is formed in the outer cylinder body, and the drill collar and the outer cylinder body on two sides of the through hole are in sealing connection; the pressure balance unit is arranged between the inner cylinder body and the outer cylinder body on one side of the through hole, the pressure balance unit is respectively in sealing connection with the inner cylinder body and the outer cylinder body, the inner cylinder body and the outer cylinder body on the other side of the through hole are in sealing connection, the pressure balance unit is in sliding connection with the inner cylinder body, and the pressure balance unit is used for compressing the closed cavity under the pressure of slurry so as to reduce the pressure difference between the closed cavity and the external slurry.
6. The mechanism according to claim 5, wherein the motor and the guide shaft are respectively located at both ends of the inner cylinder, the deflection shaft is disposed between the second connecting member and the inner cylinder, one end of the deflection shaft is connected to the motor, and the other end of the deflection shaft is connected to the guide shaft.
7. The compensation mechanism of a directional rotary steerable actuator according to claim 5, wherein a first end cap is disposed between the inner and outer barrels on the other side of the through hole, and the first end cap is sealingly connected to the inner and outer barrels, respectively.
8. The compensation mechanism of a directional rotary steerable actuator according to claim 5, wherein the pressure balancing unit comprises a piston in sliding sealing connection with the inner and outer cylinders, respectively, and an elastomer disposed on a side of the piston remote from the through-hole, the elastomer being configured in an elongated state.
9. The compensation mechanism of a directional rotary guide actuator according to claim 8, wherein the pressure balancing unit is disposed between the motor and the through hole, a second end cover is disposed between the piston and the motor, one end of the elastic body is connected to the second end cover, the other end of the elastic body is connected to the piston, and the elastic body is a spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310630127.0A CN116335538B (en) | 2023-05-31 | 2023-05-31 | Compensation mechanism of directional rotary guide actuating mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310630127.0A CN116335538B (en) | 2023-05-31 | 2023-05-31 | Compensation mechanism of directional rotary guide actuating mechanism |
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| CN116335538A CN116335538A (en) | 2023-06-27 |
| CN116335538B true CN116335538B (en) | 2023-08-01 |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7389830B2 (en) * | 2005-04-29 | 2008-06-24 | Aps Technology, Inc. | Rotary steerable motor system for underground drilling |
| US8181720B2 (en) * | 2009-06-25 | 2012-05-22 | National Oilwell Varco, L.P. | Sealing system and bi-directional thrust bearing arrangement for a downhole motor |
| US9850709B2 (en) * | 2015-03-19 | 2017-12-26 | Newsco International Energy Services USA Inc. | Downhole mud motor with a sealed bearing pack |
| CN104832088B (en) * | 2015-03-25 | 2015-11-18 | 中国石油大学(华东) | Dynamic guiding type rotary steering drilling tool and investigating method thereof |
| CN107060644B (en) * | 2016-12-28 | 2018-12-21 | 中国石油大学(华东) | A kind of wheel rotating state directional type rotary steering system and guiding control method |
| US11149498B2 (en) * | 2018-04-27 | 2021-10-19 | National Oilwell DHT, L.P. | Wired downhole adjustable mud motors |
| US10519717B2 (en) * | 2018-05-09 | 2019-12-31 | Doublebarrel Downhole Technologies Llc | Pressure compensation system for a rotary drilling tool string which includes a rotary steerable component |
| CN110469266A (en) * | 2019-08-22 | 2019-11-19 | 北京众英泰科能源科技有限公司 | A kind of remote control diameter variable stabilizer and its application method |
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